Means 10. Dix is a philosophy created by Mana, leader of Moi Dix Mois. It represents "1" meaning his start of something new, and "0" which represents his vision as a universal artist. Thus, "Dix" which translates literally to 10 in french, is essentially a philosophy, hence "Moi Dix Mois" (me ten months) which has an important meaning to Mana Sama and all Dixtors of the world.

used as a simple way of saying 'no chance', in other words the request given to one person to another is completely out of the option.
Is similar to the word 'dreaming' meaning the what someone wants or says is way out of reach.